I hope that they ______the road by the time we come back.
A. will have repaired
B. would have repaired
C. have repaired
D. had repaired
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Before long, he______all about the matter.
A. will have forgotten
B. forget
C. have forgotten
D. forgot
I _____enough to put a down-payment on a house by the time I am 30.
A. will earn
B. will have earned
C. will be earning
D. earned
二次型的化简,方法有拉格朗日配方法。
A. 对
B. 错
二次型的话简主要是把交叉项消除。
A. 对
B. 错